687736271240 has 64 divisors (see below), whose sum is σ = 1555067928960. Its totient is φ = 273735221760.

The previous prime is 687736271227. The next prime is 687736271291. The reversal of 687736271240 is 42172637786.

It is a super-2 number, since 2×687736271240² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8129399 + ... + 8213561.

It is an arithmetic number, because the mean of its divisors is an integer number (24297936390).

Almost surely, 2^687736271240 is an apocalyptic number.

It is an amenable number.

687736271240 is an abundant number, since it is smaller than the sum of its proper divisors (867331657720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

687736271240 is a wasteful number, since it uses less digits than its factorization.

687736271240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85182 (or 85178 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 53.

The spelling of 687736271240 in words is "six hundred eighty-seven billion, seven hundred thirty-six million, two hundred seventy-one thousand, two hundred forty".